Massachusetts Institute of Technology

Mollie Schwartz

William D Oliver

Danna Rosenberg

Andrew J Kerman

Donna-Ruth Webb Yost

Seth Lloyd

Michael F O'Keeffe

Jonilyn L Yoder

Wayne Woods

Thomas Hazard

Justin Mallek

Cyrus Hirjibehedin

Iman Marvian Mashhad

Gabriel Samach

Morten Kjaergaard

Amy Greene

Systems and methods for performing open-loop quantum error mitigation using quantum measurement emulations are provided. The open-loop quantum error mitigation methods do not require the performance of state readouts or state tomography, reducing hardware requirements and increasing overall computation speed. To perform a quantum measurement emulation, an error mitigation apparatus is configured to stochastically apply a quantum gate to a qubit or set of qubits during a quantum computational process. The stochastic application of the quantum gate projects the quantum state of the affected qubits onto an axis, reducing a trace distance between the quantum state and a desired quantum state.

Quantum measurement emulation error mitigation protocol for quantum computing

Qubit circuits having components formed deep in a substrate are described. The qubit circuits can be manufactured using existing integrated-circuit technologies. By forming components such as superconducting current loops, inductive, and/or capacitive components deep in the substrate, the footprint of the qubit circuit integrated within the substrate can be reduced. Additionally, coupling efficiency to and from the qubit can be improved and losses in the qubit circuit may be reduced.

Qubit circuits with deep, in-substrate components

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Cambridge, MA, United States of America

Mollie Schwartz